(19)
(11) EP 2 413 133 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.05.2013 Bulletin 2013/19

(43) Date of publication A2:
01.02.2012 Bulletin 2012/05

(21) Application number: 11173546.0

(22) Date of filing: 12.07.2011
(51) International Patent Classification (IPC): 
G01N 27/06(2006.01)
 G01N 27/416(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 26.07.2010 US 843387

(71) Applicant: Mettler-Toledo Thornton, Inc.
Bedford MA 01730 (US)

(72) Inventors:
  • Bevilacqua, Anthony
    Medford, MA Massachusetts 02155 (US)
  • Mansur, Robert
    Chelmsford, MA Massachusetts 01824 (US)
  • Marsh, David W.
    N. Scituate, RI Rhode Island 02857 (US)
  • Feng, Xiaoxing
    Newton, MA Massachusetts 02460 (US)
  • Kunicki, Richard G.
    Billerica, MA Massachusetts 01821 (US)

(74) Representative: Mettler-Toledo 
IP Department Im Langacher 44 PO Box MT-100
8606 Greifensee
8606 Greifensee (CH)

   


(54) Calibration of conductivity measurement system


(57) A system and method for calibrating a digital conductivity and temperature measuring system (2,50). A connector (20,32) is interposed between a sensor (4) and transmitter (8) of the digital conductivity and temperature measuring system. A calibrator (28), which has selectable resistors with known values, is also attached to the connector (20,52). The sensor (4) measures a raw resistance for a selected resistor. The digital conductivity and temperature measuring system then compares the raw resistance to the known value of the resistor to calculate a calibration factor.







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